I did some searching and couldn't find much info. I'm new to closed looped turbo systems... what's the advantage over traditional systems and how does it work?

If anyone knows of some pictures of the system that would be helpfull.

 

first off closed loop is more "traditonal" almost all turbo cars come from the factory closed loop, second its not really that there are advantages its just another way of doing it, both ways work fine when done right, but on a system thats supposed to be closed using a BOV vented to atmosphere will create a rich air/fuel condition (i.e. less air to fuel ratio) which will damage the catalytic converter, create soot on the exhaust pipes, and cause occasional misfiring (due to the purged air) which will result in ECU miscalculated timing adjustments and other errors.